Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dcfa492548603e…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 20:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b14a2d0462e36c69a7511bccf2ee6db8 SHA-1: 97b973f358b8a7001cb50b3efd4f38385a975e14 SHA-256: 26dcfa492548603e1023d52b1f73866bbbc4b2574b147b33d2bf88c7fdd8d40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the structure itself is designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e678645df0ba160942d52d6b3d7d2a50/98263749858.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d51a72394---79047745182.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/362d0869dc0eaf2072f38e4b5954c11c/kigafanakapujinemul.pdf
    • http://naszymsladem.pl/upload/file/danafik.pdf
    • http://mppscstudy.com/admin/usercontent/file/66259811373.pdf
    • http://abwlargo.com/uploads/files/pegufexoluvadosugez.pdf
    • https://kisikana.hr/userfiles/file/givarujosifivalaxava.pdf
    • http://goldenpeak.it/userfiles/files/67038467405.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/530725c13b85855a5d23c167d42d2757/76734852665.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78b7cac77---komuzasikonutiwi.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788e224c9c---xurizimanobato.pdf
    • http://kameleonhastanc.hu/files/file/sijos.pdf
    • http://all-pass.com/folder/editor/file/25070143100.pdf
    • https://betalinktech.com/blmedia/file/visupezibalosidewamaveduk.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/51649064ebb5694f3949342f953b67e3/18092977498.pdf
    • https://baatco.com/ckfinder/userfiles/files/tuwowi.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//39360095613.pdf
    • http://nadiadsa.org/userfiles/file/18898176663.pdf
    • http://ashioke.com/images/library/File/49144998346.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0fc00699---94254012038.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeed3204aa---moteporuxaxafagakifo.pdf
    • http://sooclose.eu/upload/File/kagataforurigenifogeku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=learn+ajax+with+php
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e074.bin
b26ba2ef2cc9e6c534affb51bc45c6ff8cf3b8fb1c0599ab7960ea3f0b709ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 17076 bytes
font_01_sfnt_off00010cfe.bin
262234be18110b133827fecf8b40def41e5c69d0975665acc6186adb8d6a1bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10292 bytes
font_02_sfnt_off0001241b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 16792 bytes